a recent study of 25 students showed they spent average of $18.53 on gas per week, the sample standard deviation of the sample was $3.00, construct a 95% confidence interval for the mean amount spent on gas per week
Here we need to use t-test as n < 30 and population standard deviation is not given.
For df = 24 and 95% confidence interval t value is 2.06
So, the confidence interval is (17.29, 19.77).
Get Answers For Free
Most questions answered within 1 hours.